-LRB- CNN -RRB- -- Gaze across the Riyadh skyline and one building immediately demands your attention .

Towering high above the city , with its distinctive inverted arch , is the 992 ft Kingdom Center -- owned by the richest man in Saudi Arabia , if not the Middle East .

Prince Alwaleed Bin Talal Al Saud 's wealth has been estimated at anywhere between just over $ 20 billion by Forbes and more than $ 30 billion by Bloomberg .

Whichever way you look at it , it 's a lot of money -- could it be set to grow ?

Inside His Majesty 's striking skyscraper is the headquarters of Kingdom Holding , one of the largest investment companies on the country 's stock exchange .

With plans to open up the market -- known locally as the Tadawul -- to foreign investors next year , this is the start of a brave new era for the phenomenally wealthy prince and Saudi businesses .

Media mogul

Alwaleed already has high-profile stakes in media groups News Corp , Time Warner -LRB- CNN 's parent company -RRB- , and Walt Disney .

Added to that , his $ 300 million stake in Twitter has quadrupled in value in just two years .

Fellow billionaire , News Corp CEO Rupert Murdoch , may have been unsuccessful in his recent attempt to take over Time Warner . But Alwaleed believes it might not be the end of the story just yet .

`` Combining both companies -LRB- News Corp and Time Warner -RRB- would have been a dream proposal because the amount of content the combined company would have had would have been tremendous , '' he said .

`` Knowing Mr Murdoch I think the idea is still in his mind . But I think the time is not right now because the management of Time Warner against it , and the shareholders of Fox were also not for it . ''

Oil rich ?

Saudi Arabia might be one of the world 's largest oil exporters , but Alwaleed says now is the time for the kingdom to look beyond crude .

`` It 's a huge worry when the price of oil goes down , '' he said .

`` I have always called on the Saudi government to reduce its dependence on oil , because as it stands today , 90 % of our annual budget is dependent on oil . And 50 % of our GDP is oil based . ''

Isis threat

Earlier this year , Saudi Arabia held exercises with 135,000 troops . But at a time where Isis exerts its power across parts of the Middle East , the prince does not believe boots on the ground is the way forward for his country .

`` I think Saudi Arabia will not be involved directly in fighting Isis in Iraq or Syria , because this does not really affect our country explicitly , '' he said .

`` Each killing by Isis that takes place is unfortunate , but hopefully every time it happens the world will be more united in eradicating this disease that 's infecting the whole Middle East . ''

Billion dollar question

While other billionaires might downplay their fortune , the prince filed a lawsuit against Forbes after he claims it underestimated his wealth .

`` They 've been undervaluing my wealth for 10 years and I did n't give attention to it , '' he said .

`` But when they came and attacked Saudi Arabia , and Kingdom Holding , and myself , that 's when I did n't accept that and that 's when we filed a lawsuit in the UK courts . ''

One thing 's for sure , this is a businessman willing to put his money where his mouth is .

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